Nonprompt direct-photon production in Au plus Au collisions at √sNN=200 GeV

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10486812" target="_blank" >RIV/00216208:11320/24:10486812 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=g_-wgB2mQR" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=g_-wgB2mQR</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevC.109.044912" target="_blank" >10.1103/PhysRevC.109.044912</a>

Result language
angličtina
Original language name
Nonprompt direct-photon production in Au plus Au collisions at √sNN=200 GeV
Original language description
The measurement of the direct-photon spectrum from Au+Au collisions at root s(NN) = 200 GeV is presented by the PHENIX Collaboration using the external-photon-conversion technique for 0%-93% central collisions in a transverse-momentum (p(T)) range of 0.8-10 GeV/c. An excess of direct photons, above prompt-photon production from hard-scattering processes, is observed for p(T) < 6 GeV/c. Nonprompt direct photons are measured by subtracting the prompt component, which is estimated as Ncoll-scaled direct photons from p + p collisions at 200 GeV, from the direct-photon spectrum. Results are obtained for 0.8 < p(T) < 6.0 GeV/c and suggest that the spectrum has an increasing inverse slope from approximate to 0.2 to 0.4 GeV/c with increasing p(T), which indicates a possible sensitivity of the measurement to photons from earlier stages of the evolution of the collision. In addition, like the direct-photon production, the p(T) -integrated nonprompt direct-photon yields also follow a power-law scaling behavior as a function of collision-system size. The exponent, a, for the nonprompt component is found to be consistent with 1.1 with no apparent p(T) dependence.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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